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| 型号： | SI2457-D-GT |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 28/60页 |
| 文件大小： | 0K |
| 描述： | IC ISOMODEM GLOBAL DAA 24TSSOP |
| 标准包装： | 62 |
| 系列： | * |
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Si2457/34/15/04
34
Rev. 1.3
%V2
Automatic Line Status Detection—Adaptive Method.
Description: Before going off-hook with the ATD, ATO, or ATA commands, the Si2457/34/15/04 com-
pares the line voltage (via LVCS) to the NLIU (U85) register:
Loop Voltage
Action
0
LVCS (0.0625 x NLIU)
Report “NO LINE” and remain on-hook.
(0.0625 x NLIU) < LVCS
(0.85 x NLIU) Report “LINE IN USE” and remain on-hook.
(0.85 x NLIU) < LCVS
Go off-hook and establish a modem connection.
The NLIU register is updated every 1 ms with the minimum non-zero value of LVCS in the last
30 ms. This allows the Si2457/34/15/04 to eliminate errors due to 50/60 Hz interference and also
adapt to relatively slow change in the on-hook dc reference value on the telephone line. This algo-
rithm does not allow any non-zero values for NLIU below 0x0007. The host may also initialize NLIU
prior to issuing the %V2 command. Once the call has begun, the off-hook intrusion algorithm
(described in "4.12.2. Off-Hook Intrusion Detection" on page 19) operates normally. In addition, the
Si2457/34/15/04 will report “NO LINE” if the telephone line is completely disconnected. If the HOI
(U77, bit 11) bit is set, “LINE IN USE” is reported upon intrusion.
Table 10. Extended AT% Command Set (Command Defaults in Bold) (Continued)
Command
Action
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| SI2457-D-GTR | 制造商:Silicon Laboratories Inc 功能描述:56 KBPS, V.90 ISOMODEM SYSTEM- 制造商:Silicon Laboratories Inc 功能描述:56 KBPS, V.90 ISOMODEM SYSTEM-SIDE - LEAD-FREE - Tape and Reel 制造商:Silicon Laboratories Inc 功能描述:IC ISOMODEM GLOBAL DAA 24TSSOP 制造商:Silicon Laboratories Inc 功能描述:56 kbps V90 ISOmodem System-Side PBF |
| Si2457FS08-EVB | 功能描述:网络开发工具 16-pin Si2457+Si3008 ISOmodem Eval Board RoHS:否 制造商:Rabbit Semiconductor 产品:Development Kits 类型:Ethernet to Wi-Fi Bridges 工具用于评估:RCM6600W 数据速率:20 Mbps, 40 Mbps 接口类型:802.11 b/g, Ethernet 工作电源电压:3.3 V |
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| Si2457FT08-EVB | 功能描述:网络开发工具 24-pin Si2457+Si3008 ISOmodem Eval Board RoHS:否 制造商:Rabbit Semiconductor 产品:Development Kits 类型:Ethernet to Wi-Fi Bridges 工具用于评估:RCM6600W 数据速率:20 Mbps, 40 Mbps 接口类型:802.11 b/g, Ethernet 工作电源电压:3.3 V |
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